Hall effect influence on a highly conducting fluid

Witalis, E

doi:10.1016/0032-1028(67)90017-x

Cited by 1 publication

(2 citation statements)

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“…Metallic (nonresistive) electrodes. For a homogeneous plasma, it has been shown (Witalis, 1965) that high current concentrations occur on the edges of metallic electrodes. But in the presence of cold boundary layers of lower electrical conductivity, the present calculations show that the nonuniformity in current distribution is considerably reduced.…”

Section: Resultsmentioning

confidence: 99%

“…In a segmented Faraday M H D generator, the anisotropic nature of plasma conductivity induces nonuniformities in current distribution, so that a one-dimensional model of current in the Faraday direction is inadequate for predicting the electrical performance of the generator. Calculations o n the two-dimensional current distribution in a M H D generator have been carried out by Haines (1967), Hurwitz et al (1961), Matsunaga (1965) and Witalis (1965) by conformal mapping, and Celenskii and Fischer (1966) and Crown (1961) by a numerical technique. Other calculations for nonequilibrium plasmas have been carried out by Oliver and Mitchner (1967) and Uncles (1973), including the effect of current induced inhomogeneities.…”

Section: Introductionmentioning

confidence: 99%

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Effect of nonideal conditions on the electrical performance of faraday MHD generators

Jayakumar¹,

Goyal²,

Ghosh³

et al. 1978

Int. J. Energy Res.

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The effect of nonideal conditions on the current flow in a MHD generator has been investigated by two‐dimensional analysis in terms of internal resistance, Hall voltage and uniformity of current distribution. In particular, the effects of (a) temperature profile along the Faraday direction in the plasma, (b) current bunching on cathode surfaces due to phenomena like arc spots, and (c) electrical leakage between adjacent electrodes due to finite resistance of the insulator segments are investigated. the results show that cold boundary layers near metallic electrode surfaces tend to relieve current concentration. the optimum resistivity of wedge‐shaped electrodes for obtaining uniform current distribution in the duct has been calculated for various temperature profiles. the results indicate that the internal resistance of a MHD generator strongly depends on the location and size of current bunched spots on cathodes. the fluctuations in the spot size and its location can lead to large fluctuations in power output. the present calculations reveal that the electrical performance of a MHD generator is not adversely affected by current leakage along insulator segments for small insulator conductivities.

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Section: Resultsmentioning

confidence: 99%